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자료유형
학술대회자료
저자정보
저널정보
한국유체기계학회 한국유체기계학회 학술대회 논문집 유체기계공업학회 제4회 한국유체공학학술대회 논문집 (제1권)
발행연도
2006.8
수록면
445 - 448 (4page)

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초록· 키워드

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The effects of surface roughness on a spatially-developing turbulent boundary layer (TBL) were investigated by performing direct numerical simulations of TBLs over rough and smooth walls. The Reynolds number based on the momentum thickness was varied in the range Re<SUB>θ</SUB>=300~1400. The roughness elements used were periodically arranged two-dimensional spanwise rods, and the roughness height was k=1.5θ<SUB>in</SUB>, which corresponds to k/δ=0.045~0.125. To avoid generating a rough wall inflow, which is prohibitively difficult, a step change from smooth to rough was placed 80θin downstream from the inlet. The spatially-developing characteristics of the rough-wall TBL were examined. Along the streamwise direction, the friction velocity approached a constant value and a self-preserving form of the turbulent stress was obtained. Introduction of the roughness elements affected the turbulent stress not only in the roughness sublayer but also in the outer layer. Despite the roughness-induced increase of the turbulent stress in the outer layer, the roughness had only a relatively small effect on the anisotropic Reynolds stress tensor in the outer layer. Inspection of the triple products of the velocity fluctuations revealed that introducing the roughness elements onto the smooth wall had a marked effect on vertical turbulent transport across the whole TBL. By contrast, good surface similarity in the outer layer was obtained for the third-order moments of the velocity fluctuations.

목차

Abstract
1. Introduction
2. Numerical details
3. Results
4. Conclusions
Acknowledgement
References

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UCI(KEPA) : I410-ECN-0101-2010-554-002110914